Select Xbox Live DLC discounted until end of October

Microsoft is running an "Extended Play Download Days" promotion between now and the end of October, with select downloadable content discounted for six Xbox 360 titles. Sure, half of the promotion consists of Beautiful Katamari accessories and stages, but we've also got Forza Motorsport 2, Mass Effect, Guitar Hero 3, Lost Odyssey and a deep discount for Oblivion Shivering Isles (from $30 to $20). Not coincidentally, today also marks the first day of the new Xbox 360 price drop.